THE EOCENE OF EUROPE AND NORTH AMERICA 



89 



(JJEB.) 



ZONES 

 Cervus 



MAMMALS 



Ovifjos 



Mcfff/lont/.x 



Eqvns 



Bison 



Cas t oroides 



/Vlastodon 



Piatygonus 



Elephas ? 



Ghiptotherium PHeuclienia 

 ^^ Fe/is 



Poracerds 



Neotragocerus 



Epigaulus 



Procamelus 



Teieoceras 

 Aelurodon 

 Neohipparion 

 Protohippus 



Ticholcptits 



Merycodus 

 Trilophodon 

 Aphelops 

 Merychippus 



ivteryciiyus 



Mcrijcorhoeras Oxydactyius 

 ^ Moropus 



„ . . , . Parahippus 



JJiccratriej'iuTn 



Eporeodon 

 Promeri/cociidcrus Steneofiber 



Entelodon 

 Leptauchenia Protoceras 



Oreodon 



Poebrotherium 

 MMamynodon 

 Hyaenodon 

 H^racodon 



Titajiofheriunh 



Leptomeryx 

 Eotyiopus 

 Mesoiiippus 

 Trigonias 



Diplacodon 



Eohasileus 



Epihippus 

 Dolichorhinus 

 Amynodon 

 Achaenodon 



Uintatherijzm Palaeosyops 



Notharctus 

 Patriofelis 

 ii/fetacheiromys 



Orohippus 



(NEW MEXICO) Eotitanops Systemodon 



~ r 7.J ^j, • Pacfjyaena 



Lambaotnermm phenacodus 



Coryphodon Eohippus 



Pan tolnmhda 



Euprotogonia 

 Chriacus 

 Pdlymastodon Periptycfius 

 Dissacijs 



Fici. 22. — Composite of the more iinijortiiiit sections, not drawn to scale, showing the 

 principal Life Zones of the entire Ca>nozoic period in western North Ainerica. Mountain 

 Basin deposits = horizontal ruling. Great Plains deposits = dotted areas. 



